What work of Science Fiction/ Fantasy does this Stack Exchange's symbol represent? [migrated]

The overall symbol that this SE site has selected to represent “Science Fiction & Fantasy” is shown above.

Every SE site that uses a symbol has chosen one that very easily represents the topic at hand. Examples include books for Academia , a 20-sided die for Role-playing Games , and a chef hat for Seasoned Advice (My pick for wittiest SE name btw).

What reason was this sites symbol chosen for and what, if any, are the work(s) of Science Fiction/Fantasy that it originates from?